Magnetospheric convection in a hybrid-Vlasov simulation.
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| Title: | Magnetospheric convection in a hybrid-Vlasov simulation. |
|---|---|
| Authors: | Tao, Shi1 (AUTHOR) shi.tao@helsinki.fi, Alho, Markku1 (AUTHOR), Zaitsev, Ivan1 (AUTHOR), Turc, Lucile1 (AUTHOR), Battarbee, Markus1 (AUTHOR), Ganse, Urs1 (AUTHOR), Pfau-Kempf, Yann2 (AUTHOR), Palmroth, Minna1,3 (AUTHOR) |
| Source: | Annales Geophysicae (ANGEO) (09927689). 2025, Vol. 43 Issue 2, p709-721. 13p. |
| Subject Terms: | *Magnetospheric physics, *Magnetic reconnection, *Plasma dynamics, *Adiabatic processes, *Plasma flow, *Magnetic flux |
| Abstract: | The Dungey cycle is a fundamental process governing large-scale plasma dynamics in the near-Earth space, traditionally examined through Magnetohydrodynamic (MHD) simulations and ionospheric observations. However, MHD models often oversimplify the complexities of driving dynamics and kinetic processes, while observational data tend to lack sufficient coverage. In this study, we utilize a hybrid-Vlasov simulation to investigate the Dungey cycle, and introduce a novel method for quantifying reconnection voltages in different Magnetic Local Time (MLT) sectors. This method is validated by comparing it with the ionospheric open flux change rate in the simulation. Our analysis identifies discrete azimuthal convection channels of closed field lines, clearly initiated by dayside reconnection and propagating to the nightside. These channels are prominent even during intervals of intense nightside reconnection. Notably, we observe that the effective length of dayside reconnection fluctuates, even under steady solar wind conditions. Our results reveal significant deviations from MHD theory, which predicts that plasma flows within the magnetosphere should follow flux tube entropy isocontours. Instead, we demonstrate that plasma flows near reconnection sites and at the terminators deviate from isentropic behavior, suggesting the presence of non-adiabatic processes in these regions. This study validates the representation of the Dungey cycle in the Vlasiator 3D simulation and enhances our understanding of global plasma convection. Future work should focus on identifying the kinetic processes that explain the deviations in the plasma convection with flux tube entropy isocontours between MHD theory and kinetic approach. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 191076303 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Magnetospheric convection in a hybrid-Vlasov simulation. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Tao%2C+Shi%22">Tao, Shi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> shi.tao@helsinki.fi</i><br /><searchLink fieldCode="AR" term="%22Alho%2C+Markku%22">Alho, Markku</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zaitsev%2C+Ivan%22">Zaitsev, Ivan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Turc%2C+Lucile%22">Turc, Lucile</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Battarbee%2C+Markus%22">Battarbee, Markus</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ganse%2C+Urs%22">Ganse, Urs</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pfau-Kempf%2C+Yann%22">Pfau-Kempf, Yann</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Palmroth%2C+Minna%22">Palmroth, Minna</searchLink><relatesTo>1,3</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Annales+Geophysicae+%28ANGEO%29+%2809927689%29%22">Annales Geophysicae (ANGEO) (09927689)</searchLink>. 2025, Vol. 43 Issue 2, p709-721. 13p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Magnetospheric+physics%22">Magnetospheric physics</searchLink><br />*<searchLink fieldCode="DE" term="%22Magnetic+reconnection%22">Magnetic reconnection</searchLink><br />*<searchLink fieldCode="DE" term="%22Plasma+dynamics%22">Plasma dynamics</searchLink><br />*<searchLink fieldCode="DE" term="%22Adiabatic+processes%22">Adiabatic processes</searchLink><br />*<searchLink fieldCode="DE" term="%22Plasma+flow%22">Plasma flow</searchLink><br />*<searchLink fieldCode="DE" term="%22Magnetic+flux%22">Magnetic flux</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The Dungey cycle is a fundamental process governing large-scale plasma dynamics in the near-Earth space, traditionally examined through Magnetohydrodynamic (MHD) simulations and ionospheric observations. However, MHD models often oversimplify the complexities of driving dynamics and kinetic processes, while observational data tend to lack sufficient coverage. In this study, we utilize a hybrid-Vlasov simulation to investigate the Dungey cycle, and introduce a novel method for quantifying reconnection voltages in different Magnetic Local Time (MLT) sectors. This method is validated by comparing it with the ionospheric open flux change rate in the simulation. Our analysis identifies discrete azimuthal convection channels of closed field lines, clearly initiated by dayside reconnection and propagating to the nightside. These channels are prominent even during intervals of intense nightside reconnection. Notably, we observe that the effective length of dayside reconnection fluctuates, even under steady solar wind conditions. Our results reveal significant deviations from MHD theory, which predicts that plasma flows within the magnetosphere should follow flux tube entropy isocontours. Instead, we demonstrate that plasma flows near reconnection sites and at the terminators deviate from isentropic behavior, suggesting the presence of non-adiabatic processes in these regions. This study validates the representation of the Dungey cycle in the Vlasiator 3D simulation and enhances our understanding of global plasma convection. Future work should focus on identifying the kinetic processes that explain the deviations in the plasma convection with flux tube entropy isocontours between MHD theory and kinetic approach. [ABSTRACT FROM AUTHOR] |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=enr&AN=191076303 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.5194/angeo-43-709-2025 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 13 StartPage: 709 Subjects: – SubjectFull: Magnetospheric physics Type: general – SubjectFull: Magnetic reconnection Type: general – SubjectFull: Plasma dynamics Type: general – SubjectFull: Adiabatic processes Type: general – SubjectFull: Plasma flow Type: general – SubjectFull: Magnetic flux Type: general Titles: – TitleFull: Magnetospheric convection in a hybrid-Vlasov simulation. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Tao, Shi – PersonEntity: Name: NameFull: Alho, Markku – PersonEntity: Name: NameFull: Zaitsev, Ivan – PersonEntity: Name: NameFull: Turc, Lucile – PersonEntity: Name: NameFull: Battarbee, Markus – PersonEntity: Name: NameFull: Ganse, Urs – PersonEntity: Name: NameFull: Pfau-Kempf, Yann – PersonEntity: Name: NameFull: Palmroth, Minna IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 07 Text: 2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 09927689 Numbering: – Type: volume Value: 43 – Type: issue Value: 2 Titles: – TitleFull: Annales Geophysicae (ANGEO) (09927689) Type: main |
| ResultId | 1 |
